Kathleen,
The /g is fine, it's how groups links are formulated on groups.io. ?The problem is in the link itself, not on the link text; for both of the?links from your OP email, hover your mouse over each look at the bottom left of your browser, and you'll see that while the link text has the full correct text, the underlying link itself is missing the?community part. ?Edit the notice, edit the links, and replace the missing text.
Cheers,
Christos
Christos Psarras